Image:NZ opinion polls 2005-2008 small.png

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[edit] Summary

Description

Graph showing support for political parties in New Zealand since the 2005 election, according to various political polls. See w:Opinion_polling_for_the_New_Zealand_general_election,_2008 for details of the polling data.
Source

self-made
Date

24 March 2008.
Author

Avenue (Avenue)
Permission
(Reusing this image)

see below

This graph was created using R's ggplot2 package. Here is the source code, available under GPL version 2 and later as well as the licenses below.

library(reshape)
library(ggplot2)
polls <- read.csv("NZ opinion polls 2006-2008.csv")
polls$Date <- as.Date(polls$Date)
lpolls <- melt(polls[,-3], id.var=c("Poll", "Date"), variable_name="Party")
names(lpolls)[4] <- "Support"
levels(lpolls$Party)[3:4] <- c("NZ First", "Maori Party")
levels(lpolls$Party)[7] <- "United Future"
lpolls$Party <- with(lpolls, reorder(Party, Support))
p <- ggplot(lpolls[(lpolls$Date >= as.Date("2005-09-17")) & 
    (lpolls$Party %in% c("Labour", "National", "NZ First", "Greens")),], 
    aes(x=Date, y=Support, colour=factor(Party)))
p + geom_point() + stat_smooth() + 
    scale_colour_manual(name = "Party", values = c("black", "forestgreen", "red", "blue")) + 
    scale_x_date(major="6 months", format="%b-%Y") +
    scale_y_continuous(breaks=seq(from=0, to=55, by=5), name="Party support (%)")

[edit] Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation license, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation license".

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Date/TimeDimensionsUserComment
current01:33, 25 April 2008900×700 (121 KB)Avenue (== Summary == {{Information |Description=Graph showing support for political parties in New Zealand since the 2005 election, according to various political polls. See w:Opinion_polling_for_the_New_Zealand_general_election,_2008 for details of the po)
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